25
CIRCULATOR B LOWER S PEED A DJUSTMENT
WARNING
T
O AVOID PERSONAL INJURY OR DEATH DUE TO ELECTRICAL SHOCK, TURN
OFF
POWER TO THE FURNACE BEFORE CHANGING SPEED TAPS.
This furnace is equipped with a PSC circulator blower motor. This
blower provides ease in adjusting blower speeds. The Product
Data Book applicable to your model provides an airflow table
showing the relationship between airflow (CFM) and external static
pressure (E.S.P.) and a table for the proper selection of heating
and cooling speeds. The cooling blower speed is shipped set on
HIGH. High heat ships on MEDIUM and low heat is shipped on
MEDIUM-LO. These blower speeds should be adjusted by the
installer to match the installation requirements so as to provide
the correct heating temperature rise and the correct cooling CFM.
To adjust the circulator blower speed, proceed as follows:
1. Turn OFF power to the furnace.
2. Select the heating and cooling blower speeds that match
the installation requirements from the airflow table in the
Product Data Book applicable to your model.(Please
contact your distributor or our website for the applicable
product data book referred to in this manual.)
3. Relocate desired motor leads to the circulator blower heat
and cool speed terminals on the integrated control module.
(Terminals are identified as LO HEAT, HI HEAT and COOL
(hot)). If a heating speed and the cooling speed are the
same, a jumper wire must be used between the heat and
cool terminals.
4. Connect all unused blower motor leads to the “PARK”
terminals on the integrated control module. Any leads not
connected to the “PARK” terminals must be taped.
5. Turn ON power to furnace.
6. Verify proper temperature rise as outlined in Temperature
Rise section.
CIRCULATOR B LOWER FAN TIMING A DJUSTMENT
NOTE: Items in this section refer to the air circulator blower fan,
NOT to the induced draft blower. The induced draft blower timing
sequence is not adjustable. The circulator blower fan timing is
adjustable only on models with optional “heating fan OFF delay”
adjustment pins or switches. It is NOT adjustable in any other
circumstances.
As shipped, the circulator blower fan will remain on for 150
seconds after the gas valve closes. When a call for cooling occurs,
the circulator fan comes on and remains on for 45 seconds after
the call for cooling ends. During normal heating operation, the
circulator fan will come on approximately 34 seconds after the
gas valve opens.
O
N
O
F
F
O
N
O
F
F
1
150
SECOND
DELAY
100
SECOND
DELAY
1
Switch viewed in an upflow installation.
Adjustment Switch
XIII. OPERATIONAL CHECKS
WARNING
T
O AVOID PERSONAL INJURY OR DEATH, DO NOT REMOVE ANY INTERNAL
COMPARTMENT COVERS OR ATTEMPT ANY ADJUSTMENT.
E
LECTRICAL
COMPONENTS ARE CONTAINED IN BOTH COMPARTMENTS.
C
ONTACT A
QUALIFIED SERVICE AGENT AT ONCE IF AN ABNORMAL FLAME APPEARANCE
SHOULD DEVELOP.
BURNER FLAME
The burner flames should be inspected with the burner
compartment door installed. Flames should be stable, quiet,
soft, and blue (dust may cause orange tips but they must not be
yellow). Flames should extend directly outward from the burners
without curling, floating, or lifting off. Flames must not impinge on
the sides of the heat exchanger firing tubes.
Check the burner flames for:
1. Good adjustment
2. Stable, soft and blue
3. Not curling, floating, or lifting off.
Burner Flame
AUXILIARY LIMIT C ONTROL
Auto reset limits are located on or near the blower. To access this
auxiliary limit, disconnect the electrical power and remove the
blower door. The auxiliary limit control is designed to prevent
furnace operation in case of main blower failure on horizontal
installations. It may also open if the power supply is interrupted
while the furnace is firing. The auxiliary limit control is suitable for
both horizontal right and horizontal left installations. Regardless
of airflow direction, it does not need to be relocated.
WARNING
T
O AVOID PERSONAL INJURY OR DEATH, DO NOT REMOVE ANY INTERNAL
COMPARTMENT COVERS OR ATTEMPT ANY ADJUSTMENT.
E
LECTRICAL
COMPONENTS ARE CONTAINED IN BOTH COMPARTMENTS.
C
ONTACT A
QUALIFIED SERVICE AGENT AT ONCE IF AN ABNORMAL FLAME APPEARANCE
PREVENT PROPERTY DAMAGE, PERSONAL INJURY OR DEATH DUE TO FIRE,
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